Injection molding machine controls
US4311446A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1974 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Apr 3, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/76
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for controlling the parameters of injection molding processes in a machine having a barrel with a plasticating chamber and a screw, rotatably and slidably disposed in said chamber, hopper means adjacent one end of said chamber communicating therewith and nozzle means disposed in the other end of said chamber communicating with a mold. Control of the injection molding process is achieved through an event recognition philosophy by sensing screw position, screw injection velocity, melt temperature, comparing the values at certain instances during the work cycle with known or desired values and using these values, changes of values and differences of values to monitor and initiate changes in the process parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.